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Inversion method of lithology parameters of pre-stack seismic reservoirs

A technology of lithology parameters and pre-stack seismic, applied in the field of seismic oil and gas exploration and development, can solve the problems of low accuracy of seismic identification of lithology and high risk of oil and gas exploration and development, and achieve the effect of simple application, reduced risk and improved accuracy

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] However, the above-mentioned AVO technology has the problems of low accuracy of seismic identification of lithology and high risk of oil and gas exploration and development

Method used

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  • Inversion method of lithology parameters of pre-stack seismic reservoirs
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  • Inversion method of lithology parameters of pre-stack seismic reservoirs

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Embodiment

[0040] Case overview: After implementing 3D seismic in an oilfield off the coast of West Africa, basic research on rock physics shows that seismic P-wave impedance cannot effectively distinguish sand and mudstone. Then, based on the analysis of the well's reservoir elastic parameters, pre-stack AVO attribute lithology identification and oil and gas detection were carried out. The area of ​​the research area is 200km 2 , the water depth is 1200-1500m, and the reservoir depth is 2200-3200m. The main target layer is the Tertiary Oligocene turbidite sandstone formed in the deep sea environment, and the main extension direction is nearly north-south. According to the need to improve the prediction accuracy of sandstone, the research and application of related technologies have been carried out. The specific implementation is as follows:

[0041] (1) Constructing P-wave impedance curves and gradient impedance GI curves of key well reservoirs, wherein the construction of P-wave impe...

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Abstract

The invention relates to the field of seismic oil and gas exploration and exploitation, and provides an inversion method of lithology parameters of pre-stack seismic reservoirs. The method includes lithology parameter inversion of seismic gradient impedance reservoirs, and growth of the reservoirs can be predicted.

Description

technical field [0001] The invention relates to the field of seismic oil and gas exploration and development, in particular to an inversion method of pre-stack seismic lithology parameters. Background technique [0002] AVO (Amplitude Versus Offset, variation of amplitude with offset) technology is used to study the variation characteristics of seismic reflection amplitude with the distance between the shot point and the geophone, that is, the offset (or incident angle) to explore the reflection coefficient response with the shot. The change of the survey distance (or incident angle) can be used to determine the lithological characteristics and physical parameters of the overlying and underlying medium on the reflection interface. With the help of AVO technology, oil and gas exploration and development technicians can better evaluate the rock properties of oil and gas reservoirs. [0003] Compared with post-stack seismic oil and gas information, because pre-stack seismic am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 苑书金高君陈立莹
Owner CHINA PETROLEUM & CHEM CORP
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